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    Subject[PATCH 01/12] sched: Mark boot-cpu active before smp_init()
    A UP machine has 1 active cpu, not having the boot-cpu in the active
    map when starting the scheduler confuses things.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    Index: linux-2.6/init/main.c
    ===================================================================
    --- linux-2.6.orig/init/main.c
    +++ linux-2.6/init/main.c
    @@ -369,12 +369,6 @@ static void __init smp_init(void)
    {
    unsigned int cpu;

    - /*
    - * Set up the current CPU as possible to migrate to.
    - * The other ones will be done by cpu_up/cpu_down()
    - */
    - set_cpu_active(smp_processor_id(), true);
    -
    /* FIXME: This should be done in userspace --RR */
    for_each_present_cpu(cpu) {
    if (num_online_cpus() >= setup_max_cpus)
    @@ -486,6 +480,7 @@ static void __init boot_cpu_init(void)
    int cpu = smp_processor_id();
    /* Mark the boot cpu "present", "online" etc for SMP and UP case */
    set_cpu_online(cpu, true);
    + set_cpu_active(cpu, true);
    set_cpu_present(cpu, true);
    set_cpu_possible(cpu, true);
    }
    --



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